(19)

(11)

EP 1 797 211 A1

(12)

(43) Date of publication: 20.06.2007 Bulletin 2007/25 (21) Application number: 05782474.0 (22) Date of filing: 01.09.2005

(51) International Patent Classification (IPC):  C22F 1/14(2006.01) C22F 1/00(2006.01) C22C 5/04(2006.01) (86) International application number: PCT/IB2005/002580 (87) International publication number: WO 2006/024928 (09.03.2006 Gazette 2006/10)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 02.09.2004 ZA 200406994 (71) Applicant: University of Cape Town Cape Town 7701 (ZA)	(72) Inventors: Nxumalo ,silethelwe Bulawayo (ZM) LANG, Candace, Irene 7708 CLAREMONT (ZA) (74) Representative: Albutt, Anthony John et al D Young & Co 120 Holborn London EC1N 2DY London EC1N 2DY (GB)